Difference between revisions of "U23 2007/Inhalt Abend 2"
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avrdude -p m644 -b 115200 -c avr109 -P /dev/ttyUSB0 -F -u -U flash:w:tmp.hex | avrdude -p m644 -b 115200 -c avr109 -P /dev/ttyUSB0 -F -u -U flash:w:tmp.hex | ||
echo X > /dev/ttyUSB0 | echo X > /dev/ttyUSB0 | ||
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=== Frage === | === Frage === | ||
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return 0; | return 0; | ||
} | } | ||
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| + | [[Category:U23 2007]] | ||
Latest revision as of 13:56, 28 May 2007
Beispiele:
Testen & Kompilieren
testdatei:
#include <avr/io.h>
int main(void) {
DDRA = 0xFF;
PORTA = 0xAA;
return 0;
}
kompilieren:
avr-gcc -mmcu=atmega644 -Wall -o direkt.elf direkt.c
hex-file erzeugen:
avr-objcopy -O ihex direkt.elf direkt.hex
bootloader starten (strom raus, launch-bootloader starten, strom rein, warten bis blinkt):
launch-bootloader /dev/ttyUSB0 115200
installieren:
avrdude -p m644 -b 115200 -c avr109 -P /dev/ttyUSB0 -F -u -U flash:w:direkt.hex
flash script (usb):
#!/bin/bash avr-gcc -mmcu=atmega644 -Wall -o tmp.elf $1 avr-objcopy -O ihex tmp.elf tmp.hex launch-bootloader /dev/ttyUSB0 115200 avrdude -p m644 -b 115200 -c avr109 -P /dev/ttyUSB0 -F -u -U flash:w:tmp.hex echo X > /dev/ttyUSB0
Frage
Was tut dieses Programm?
#include <avr/io.h>
int main(void) {
while (1) {
DDRA = 0xFF;
PORTA ^= 0xAA;
uint16_t i;
uint16_t j;
for (i = 0; i < 5; i++) {
for (j = 0; j < 0xffff; j++) {
/* nix */
}
}
}
return 0;
}
